Experimental Study on Concrete Encased Composite Beam with Web Opening

Cold-formed steel members are extensively used in the building construction industry, especially in residential, commercial and industrial buildings. In recent times, the use of cold-formed high strength steel members has rapidly increased. In this flexural behavior of concrete encased cold formed steel composite beam with M20 grade concrete is investigated by conducting experimental study. Totally four beam specimen with and without web opening are tested with different percentage of steel thickness 2mm, 2.5mm and 3mm. The cross section of beam was kept such that span to depth ratio varied from 6 to 8. The cold formed steel of I section with web opening is used to avoid slip and to transfer horizontal shear between cold formed steel and concrete. The shear connectors are provided for the beam without web opening. Experimental testing is done to study the flexural behavior of the beam with two-point loading. The cracking load, load-deflection behavior, ultimate load and failure Patten of the beam to be studied. Result showed that the beam encased concrete with web opening performed better compared to without web opening and the beam with the minimum percentage of steel shows the minimum deflection compared to other beams.